FLOWS Berichtzusammenfassung

UP MIMO (OFDM) scheme

A novel transmission scheme was proposed, that can adapt the available amount of channel information at the transmitter to the current situation. If the channel is static, all information is re-transmitted to the transmitter, and the scheme is then equivalent to the (optimum with bit-loading) SVD scheme. On the other hand, if the channel varies fast, no information is re-transmitted, and then scheme is then (essentially) equivalent to V-BLAST. If the channel is somewhere in between, a variable number of parameters are re-transmitted.

A complexity analysis shows that the additional complexity compared to the SVD scheme is cubic in the number of antennas and linear in the number of tones (OFDM). This complexity has to be paid for the increased flexibility in adapting to the channel. Furthermore, It is shown by capacity computations, that increasing the number of re-transmitted parameters also increases performance.